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Finding the Fourth Proportional to 572, 857.64 and 409.28

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Solution

The fourth proportional to 572, 857.64 and 409.28 is: 613.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    572 : 857.64 = 409.28 : x
  2. Step 2: Convert to fraction form
    572/857.64 = 409.28/x
  3. Step 3: Cross multiply
    572x = 857.64 × 409.28
  4. Step 4: Simplify right side
    572x = 351,014.90
  5. Step 5: Solve for x
    x = 351,014.90/572
  6. Step 6: Final answer
    x = 613.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.